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be thickly + past participle
thickly 常与表示覆盖、分布意义的过去分词连用，如 covered、populated、wooded。
The mountain slopes are thickly covered with pine trees.
山坡上厚厚地覆盖着松树。
厚厚地
先理解核心含义，再看它在真实句子里的用法。
厚厚地
in a thick layer or manner; with thickness
The mountain slopes are thickly covered with pine trees.
山坡上厚厚地覆盖着松树。
厚厚地；浓密地。
In a thick manner.
She spread the butter thickly on her warm toast.
她把黄油厚厚地抹在热吐司上。
Snow lay thickly on the ground after the storm.
暴风雪过后，积雪厚厚地覆盖着地面。
He poured the honey thickly over the pancakes.
他把蜂蜜厚厚地浇在煎饼上。
thickly 常与表示覆盖、分布意义的过去分词连用，如 covered、populated、wooded。
The mountain slopes are thickly covered with pine trees.
山坡上厚厚地覆盖着松树。
用于表示在表面厚厚地涂抹或撒放某物。
She spread the jam thickly on her toast.
她在吐司上厚厚地涂了一层果酱。
speak thickly 指说话声音含糊，常因醉酒、哭泣或生病引起。
He spoke thickly, as if he had been drinking.
他说话含糊不清，好像喝了酒似的。
Not this
The soup is too thickly.
Use this
The soup is too thick.
系动词 be 后面需要接形容词作表语，不能用副词。thickly 是副词，意为‘厚厚地/浓稠地’，此处应改用形容词 thick 来描述汤的浓稠状态。
Not this
He speaks thick.
Use this
He speaks thickly.
修饰实义动词 speak 要用副词 thickly（口齿不清地），而不是形容词 thick。汉语中‘含糊’常被误当作形容词直接放在动词后，但英语需要加 -ly 构成副词来修饰动词。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
人口稠密的
The city is thickly populated, and housing is expensive.
这座城市人口稠密，住房昂贵。
林木茂密的
They walked through a thickly wooded valley.
他们穿过一个林木茂密的山谷。
厚厚覆盖的
The ground was thickly covered with snow.
地面被厚厚的雪覆盖着。
切成厚片的
The recipe calls for thickly sliced onions.
食谱要求把洋葱切成厚片。
口齿不清地说
He spoke thickly, as if he had just woken up.
他口齿不清地说话，好像刚醒来。
人口稠密的
The coastal area is thickly populated.
这个沿海地区人口稠密。
树木茂密的
They walked through a thickly wooded valley.
他们穿过一个树木茂密的山谷。
Use thickly naturally, then get feedback on meaning, tone, grammar, and phrasing.
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thick + ly = thickly，厚厚地、浓稠地；想象面包上厚厚抹一层花生酱。
语域：neutral 常见场景：cooking and food descriptions、narrative or literary descriptions、describing unclear speech 该词多用于中性书面或口头表达，比较常见于描述物体厚度、浓稠度或说话含糊。在烹饪说明和叙述性文字中较自然，正式场合也可使用。
真正与 thickly (/ˈθɪkli/) 押韵的常用词：quickly, sickly, prickly, tickly（均读 /ɪkli/）。注意拼写相似的 thick (/θɪk/) 和 thinly (/ˈθɪnli/) 并不押韵：thick 少了 /li/，thinly 以 /nli/ 结尾。
Dictionary facts from ECDICT, WIKTIONARY.